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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### Sticky: Forum Guidelines: Smart posting behavior pays off

Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

• Replies: 1
• Views: 197,032
07-16-2014, 11:01 AM
2. ### Sticky: We only provide homework help to those who show effort

Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

• Replies: 0
• Views: 66,893
09-30-2005, 09:44 AM
1. ### Maximum Likelihood estimator

If X_1,X_2,....,X_n is a random sample with density f(x;\theta )=\frac{(x+1)}{\theta(\theta+1)}e^{\frac{-x}{\theta}}I_{(0,\infty)}(x),\theta>0 ...

• Replies: 4
• Views: 1,577
03-19-2015, 10:34 AM
2. ### STATS 311 HW Help

An aircraft identification system is able to decide whether an aircraft entering the airspace is a friend or an intruder correctly 98% of the time....

• Replies: 1
• Views: 816
03-19-2015, 08:15 AM
3. ### Estimator

Find the maximum likelihood estimator of f(x/\theta)=\theta(\theta +1)x^{\theta -1}(1-x)I_{}(x),\theta>0 ...

• Replies: 3
• Views: 1,196
03-19-2015, 07:46 AM
4. ### Am I using the right tests for my data set (correlation, multiple regression, ANCOVA)

So I'm doing a study where I'm looking at what foraging habitats different fish associate with. I'm interested in seeing if foraging surface (i.e....

• Replies: 3
• Views: 1,729
03-19-2015, 07:35 AM
5. ### Why are these statements false?

Hello, I was doing a practice test and I got two questions wrong. The answer key said that these two statements were false: As sample size...

• Replies: 1
• Views: 1,263
03-19-2015, 02:39 AM
6. ### ANOVA and P-value

I have a linear regression with an ANOVA table with F(4,8) = 2.763 Regression: 4 df Residual: 8 df F Statistic: 2.763 Significance: .103 ...

• Replies: 1
• Views: 1,353
03-18-2015, 02:39 PM
7. ### Question regarding statistical analyses of a trial

I am a college student currently doing a seminar presentation on a drug's effects on insomnia. I am currently looking at trials, and one of the tools...

• Replies: 1
• Views: 1,389
03-18-2015, 02:16 PM
8. ### Upper limit for a distribution

Hi, I needed help for something I've been trying to figure out on my own: the standard deviation and mean for GPA at my college. I was able to...

• Replies: 3
• Views: 1,229
03-18-2015, 08:36 AM
9. ### ANOVA analysis based on a mixture of within subject and between subject design?

I have finished an experiment, and I used a mixture of within subject and between subject design, I am wondering if there is a specific name for this...

• Replies: 0
• Views: 1,038
03-18-2015, 08:23 AM
10. ### How to Calculate Confidence Intervals for Proportions - Quick response appreciated!

I would like to calculate the 95% confidence intervals (CI) for the percentage of a sample who have an anxiety disorder. For example, if 20...

• Replies: 2
• Views: 1,024
03-18-2015, 07:04 AM
11. ### Questions about the standard error

SAMPLES The sample mean is an estimate of the population mean. And, the standard error (SE) of the sample mean -- s/SQRT(n) -- is a measure of...

• Replies: 0
• Views: 833
03-18-2015, 06:27 AM
12. ### Maximum Likelihood estimator

If X_1,X_2,....,X_n is a random sample of X with density f(x;\theta)=\frac{\theta}{x^2}I_{ i)Find the estimator of moments and discuss its...

• Replies: 8
• Views: 1,987
BGM
03-17-2015, 04:41 PM
13. ### Hypothesis when seeking no differences

Hi everyone, and thanks in advance for any help that is offered. I am working on my dissertation proposal and hit a bit of a wall when deciding...

• Replies: 17
• Views: 3,457
03-17-2015, 03:00 PM
14. ### Help analysing percentage change and arcsine

I'm doing a project at the moment and am currently looking at the percentage change. In order to test it statistically, I have been told I need to...

• Replies: 0
• Views: 2,145
03-17-2015, 02:36 PM
15. ### Non parametric equivilent to ANCOVA

Is there a non parametric test equivilent to an ANCOVA?

• Replies: 5
• Views: 22,477
03-17-2015, 12:54 PM
16. ### Failure to understand hypothesis testing data reqs

Hi, I'm new to hypothesis testing so please go easy on me..... I'm having trouble understanding the data requirements for hypothesis testing. I...

• Replies: 0
• Views: 935
03-17-2015, 12:06 PM
17. ### [Multivariate analysis] Interest in each response variable separately

Hei everyone I have a fully crossed experiment with three factors (Season, Infection, Starvation) and for each combination I measure gene...

• Replies: 0
• Views: 1,095
03-17-2015, 10:42 AM
18. ### Better idea than to use Excel 6th degree polynoma for curve fitting

I have non-linear data for children aged 0-18 years, 1 per year, and would like to fit a curve to the data from which I'll calculate reference values...

• Replies: 0
• Views: 1,229
03-17-2015, 05:33 AM
19. ### Regression vs Correlation dont understand

Can any one explain the difference between regression and correlation in simple terms. Doing my homework rn worth 10 points. I dont know which...

• Replies: 3
• Views: 1,543
03-17-2015, 01:59 AM
20. ### Confusion on Normal distribtuion combinations

Two large retail giant stores A & B price a brand of milk powder in such a way that A's price X follows N(50, 3^2) while B's price Y follows N(46,...

• Replies: 3
• Views: 1,230
BGM
03-17-2015, 12:08 AM
21. ### Repeated measures ANOVA vs. something else??

Hi, there. A group of us are interested in examining if there is consistency in the 'academic' rigor in a particular course offered at a school. ...

• Replies: 2
• Views: 1,020
03-16-2015, 05:53 PM
22. ### [SPSS] Comparing groups: variances are not equal

Hi, I have a data set which is normally distributed but the variances are not equal. I did transformation but this not work. which kind of test I...

• Replies: 3
• Views: 1,677
03-16-2015, 06:36 AM
23. ### F-stat and F-critical difference

Does it matter the difference in the F stat and the F critical? In other words, my F stat is 58.9 and the F critical is 4.19. That means the null...

• Replies: 1
• Views: 1,381
03-15-2015, 12:47 PM
24. ### ANOVA in SPSS

Hello all! I have a population of 76 students, separated into 3 sample groups (all differing in quantity) based on the factor (self-regulation). I...

• Replies: 0
• Views: 1,199
03-15-2015, 09:08 AM
25. ### Multiple Mediation Model using INDIRECT Macro Vs. Amos - different results!

Hi, I have a multiple mediation model with 1 IV, 6 mediators, and 1 DV (all are continuous variables). I also have one covariate to control for. I...

• Replies: 0
• Views: 1,500
03-14-2015, 06:18 PM
26. ### Statistical Difference vs. Norm

Hello, I would appreciate your help with something. I have a study to test an advertisement of n=150. The results are given as percentages for...

• Replies: 10
• Views: 2,310
03-14-2015, 04:35 PM
27. ### t-test

Hello all, I am trying to run a t-test on small data. I have 2 groups of 5 cases each. The mean of group 1 is 34 and in group 2 is 12. The...

• Replies: 0
• Views: 1,356
03-14-2015, 03:11 AM
28. ### Creating a Forest Plot for Prevalence Studies in SPSS

Hi All, I need to create a forest plot for my literature review on prevalence, and was wondering if any one has any experience creating one in...

• Replies: 0
• Views: 2,707
03-13-2015, 10:56 PM
29. ### Error bars don't overlap but aren't significantly diff. - interpretations/reasons?

Hello all, I'm struggling to understand/interpret my graph and kruskal wallis test. Basically, I've created a bar graph which looks pretty good....

• Replies: 5
• Views: 2,270
03-13-2015, 10:27 PM
30. ### Calculate average for irregular time series

Hello I have irregular time series because only data changes are stored. So all data is available. I would like to calculate a time weighted...

• Replies: 0
• Views: 1,215
03-13-2015, 02:24 PM
31. ### Hypergeometric distribution

Hi, I hope you can help, i have an assignment i can not solve: You proffessor in sample theory think that their is 400 students 2 years ago,...

• Replies: 2
• Views: 1,270
03-13-2015, 02:00 PM
32. ### Name of proportion scaling by group

I sometimes use a for of scaling where I split the data i=by a grouping variable and weight by 1/n for that group. I'll show it below. 2 questions:...

• Replies: 0
• Views: 940
03-13-2015, 09:59 AM
33. ### Correct statistical test to use for my data...

Hello everyone, Potentially a silly question (but I am new to all of this): I have collected data from a focal animal study on Naked mole-rats....

• Replies: 0
• Views: 946
03-13-2015, 06:33 AM
34. ### Is it correct to use chi-square test here? Quick reply highly appreciated!

Dear colleagues, very quick and brief advice is highly appreciated! I am about to finish work and have only one hesitation. Situation: 1) In...

• Replies: 3
• Views: 1,487
03-13-2015, 06:03 AM
35. ### Bayes Estimator under quadratic loss function

Let X,\theta be two random variables with a joint distribution, and \mu(\theta)=E. Suppose we have n observations on X given \theta, with the further...

• Replies: 1
• Views: 1,796
03-11-2015, 09:01 PM
36. ### Correlation between variables or factors?

Hi All, My independent variable consists of two factors (scales) and the dependent variable is the same (two factors or two scales). The factors...

• Replies: 0
• Views: 1,007
03-11-2015, 07:57 PM
37. ### T-stat and Sign test

Hi folks just looking for a quick bit of advice, I am conducting an event study on how the news announcements of macro economic indicators may...

• Replies: 2
• Views: 1,649
03-11-2015, 03:17 PM
38. ### Quick Question on Hypothesis Testing

Let's say you test hypothesis at alpha=.05, does that mean that 5% of your rejections will be wrong? Is this statement true? If not, can you give...

• Replies: 5
• Views: 1,782
03-11-2015, 02:35 PM
39. ### Help sample size

Hello friends, I like to know how to calculate this and any help you can give, I will be very grateful. I interested to know to design a...

• Replies: 1
• Views: 2,150
03-11-2015, 11:30 AM
40. ### Need real data set

Hi, I have to find a real data set (can not be from a book) to perform discriminant analysis, manova, PCA, and a few other tests. It should not...

• Replies: 1
• Views: 1,930
03-11-2015, 10:55 AM
41. ### Sampling Distribution Models - Homework question

The question is: In a really large bag of M&M’s, the students in Exercise 8 found 500 candies, and 12% of them were green. Is this an unusually...

• Replies: 1
• Views: 2,080
03-11-2015, 08:56 AM
42. ### Identifying the significant properties

Hello, I have a problem in linguistic, and I believe statistics is what can help me solve it, but I don't know how. I have a list of vowels...

• Replies: 0
• Views: 1,082
03-11-2015, 03:28 AM
43. ### New SPSS user

I am new to SPSS and the data input is a little confusing. For instance, i have a rating scale used by 3 students, daily over 6 weeks. the rating...

• Replies: 1
• Views: 864
03-11-2015, 03:23 AM
44. ### Can I use all correlation metrics also for time series?

I was using the cross correlation function in R (ccf) until now to discover correlations and lags between two time series. I was wondering if I...

• Replies: 3
• Views: 1,370
03-10-2015, 01:54 PM
45. ### Calculating Sample Size - Determining Sampling Plan

Hi All, I need some help to determine the best method to go about setting up a sampling plan of some sort. Here is the situation... our business...

• Replies: 2
• Views: 1,373
03-10-2015, 08:23 AM
46. ### Inter rater reliability

Question: There are 2 raters. Each raters rates a person twice. The raters rates 0 or 1. I would like to see the inter rater reliability...

• Replies: 0
• Views: 1,085
03-09-2015, 06:16 PM
47. ### Mean and variance

Hello, I have a question, I think it's not solvable, maybe I miss something... "A set of 10 numbers is given. The mean of the group is 10, and the...

• Replies: 4
• Views: 1,913
03-09-2015, 04:00 PM
48. ### List of Countries by External Debt Statistics

United States holds the first place followed by United Kingdom and France in external debt

• Replies: 0
• Views: 1,349
03-09-2015, 08:58 AM
49. ### Distribution/Sampling for Defects. HELP!

I'm working on a project and the question is, "Company X no longer wants to check all of the items for a defect, can a sample be taken? If so what...

• Replies: 0
• Views: 2,258
03-08-2015, 12:36 PM
50. ### difference between differences!

Dear all, I'm asking your help for solving the following - likely trivial - problem: I have 3 means (w/ relative st dev). Let's call them A, B,...

• Replies: 0
• Views: 1,036
03-08-2015, 04:03 AM
51. ### Clinical Trials: Recommended Reading

I was wondering if anyone could recommend some literature - online or otherwise - regarding the statistical procedures and considerations involved in...

• Replies: 2
• Views: 1,530
03-08-2015, 03:42 AM
52. ### Time Series Forecast Question - Weekly Sparse Data with Variable Starting Point

Hi Folks, I am working on building a time series forecast model for a problem which involves dataset of manufacturers and their product offerings...

• Replies: 0
• Views: 1,245
03-07-2015, 04:38 PM
53. ### Uniforming data to produce better graph

Hello, forum! This is my first post here and I really hope someone can help me. I have to draw a graph of two very long columns of data. Both...

• Replies: 0
• Views: 1,186
03-07-2015, 02:42 PM
54. ### Analytical flow, correlation research

Hi Stat's experts. For my Experiment which I classified as Correlational research I will look for relations to Breathing pattern disorders (BPD)....

• Replies: 0
• Views: 949
03-07-2015, 05:22 AM

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